... pen touch the pages and speak the content. This kind of new technology is OID. The pen has a optical ... D barcode on it, when the pen touch the position of the page, the optical head can identify the code, so it ... in the pen, we can download more than one file of the book to the pen, so one pen can ... for kids learning.6. Touch gamesWe can design many kind of touch game in the sound books, let chilsren to ...